Generic Plot() Function

• Basic function in R
• 2D format
• Correlation
• Scatter plots and line graphs

The generic syntax for the Plot function is:

Plot(x,y…)

Advanced Plot() Function

Advanced Plot function syntax is:

plot(x, y, type, main, sub, xlab, ylab)

where…

“p”: points
“l”: lines
“b”: both point and lines in a single place
“c”: join empty point by the lines
“o”: both lines and over-plotted point
“h”: histogram “s”: stair steps
“n”: no plotting

“xlab”: x-axis legends
“ylab”: y-axis legends

Example Exercise

Exam grades of 10 students in two courses, X and Y, respectively

X = 40, 15, 50, 12, 22, 29, 21, 35, 14, 15
Y = 41, 42, 32, 14, 42, 27, 13, 50, 33, 22

Exercise 1: Define X and plot as lines plot

X = c(40, 15, 50, 12, 22, 29, 21, 35, 14, 15)
plot(X ,type = "l")

Exercise 2: Define Y and plot as points plot

Y = c(41, 42, 32, 14, 42, 27, 13, 50, 33, 22)
plot(Y ,type = "p")

Plot() Function Capabilities

Alternative Visulization Tools: ggplots()

install.packages("ggplot2")

Case Study: Visualization of COVID-19

Package: nCov2019
By: Dr. Guangchuang Yu (Southern Medical University)

remotes::install_github("GuangchuangYu/nCov2019")  

Explore 1st Impression of dataset

Assign x and y

x <- get_nCov2019()
y <- load_nCov2019()

Check results for x and y

x
  
China (total confirmed cases): 95901
last update: 2020-12-21 20:45:32

y
  
nCov2019 historical data 
last update: 2020-11-26 

Visualize with line graph using ggplot()

Visualize a static map with plot()

install.packages("maps")  

Bonus: Visualize a moving map with magick()

install.packages("magick")